Clinical Trial with a Percutaneously Inserted Intra-aortic Balloon Pump: A Wider Spectrum of Patient Application - Phillips, S J; Gordon, D F; Iannone, L; Kongtahworn, Ch; Beshany, S E; Zeff, R H; Zeff, R L; Brown, T M (The Thoracic and Cardiovascular Surgeon, 1980)